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    Morphological and interlayer geochemical studies on manganese nodules from the southwestern Carlsberg ridge

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    Mar_Geol_84_81.pdf (785.4Kb)
    Date
    1988
    Author
    Valsangkar, A.B.
    Rajamanickam, G.V.
    Karisiddaiah, S.M.
    Siddiquie, H.N.
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    Abstract
    Mixed facies of manganese nodules from the southwestern Carlberg Ridge have been analysed for Mn, Fe, Ni, Cu, Co and Zn. Seventy one analyses including the averages presented for outer layer, inner layer and near-core material. Morphological studies show seven types of nodules of which medium-size spheroidal and intergrown nodules are most abundant. Only spheroidal and ellipsoidal nodules with rough surfaces show higher concentrations of Mn, Fe, Cu, Ni, Co and Zn towards the outer layer, whereas the smooth-surface nodules other than the spheroidal type show higher concentrations of these elements towards the core region. The other nodule types show a decreasing content of these elements in all the layers analysed. Copper and Ni are present in low concentrations and are associated with Zn and Mn. The mineralogy indicates diagenetic processes involving metal remobilisation, and the chemistry suggests the precipitation of metals mostly from seawater. Variations in the source of supply of the elements are responsible for the observed variations in the chemical composition of the nodules
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    http://drs.nio.org/drs/handle/2264/7054
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